Fuel usage when visiting IP

Hi guys,
One of my IP's is interstate, a few km from my parents house. I went to visit (do maintenance jobs) and used my fathers car for a lot of back and forth driving, and to be picked up from airport. I have kept some fuel receipts, hoping to claim the usage of my dad's car as a deduction. I have been told this does not qualify.
Any thoughts would be appreciated.

Thanks
 
What if I was to hire a car for these jobs. I had to remove some trees and could have hired a truck?

Luckily my father has a ute, so I used it to dump the branches on a friends farm.
 
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